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FileManager Data Binding to Flat Data

This article explains how to bind the FileManager for Blazor to flat data. Before continuing, make sure you are familiar with the FileManager data binding basics.

Flat data means that the entire collection of FileManager items (both files and directories) is available at one level, for example List<FlatFileEntry>.

The parent-child relationships are created through internal data in the model - the ParentId field which points to the Id of the item that will contain the current item. The root level has null for ParentId. There must be at least one node with a null value so that the FileManager renders anything.

You must also provide the correct value for the HasDirectories field - for the directories that have subdirectories, you must set it to true, so that the expand arrow is rendered.

Example of flat data in a FileManager

<TelerikFileManager Data="@Data"
                    @bind-Path="@DirectoryPath"
                    Height="400px"
                    IdField="MyModelId"
                    NameField="Name"
                    SizeField="Size"
                    PathField="Path"
                    ExtensionField="Extension"
                    IsDirectoryField="IsDirectory"
                    HasDirectoriesField="HasDirectories"
                    ParentIdField="ParentId"
                    DateCreatedField="DateCreated"
                    DateCreatedUtcField="DateCreatedUtc"
                    DateModifiedField="DateModified"
                    DateModifiedUtcField="DateModifiedUtc"/>
@code {
    public List<FlatFileEntry> Data = new List<FlatFileEntry>();
    public string DirectoryPath { get; set; } = string.Empty;

    // fetch the FileManager data
    protected override async Task OnInitializedAsync()
    {
        Data = await GetFlatFileEntries();
    }

    // a model to bind the FileManager. Should usually be in its own separate location.
    public class FlatFileEntry
    {
        public string MyModelId { get; set; }
        public string ParentId { get; set; }
        public string Name { get; set; }
        public long Size { get; set; }
        public string Path { get; set; }
        public string Extension { get; set; }
        public bool IsDirectory { get; set; }
        public bool HasDirectories { get; set; }
        public DateTime DateCreated { get; set; }
        public DateTime DateCreatedUtc { get; set; }
        public DateTime DateModified { get; set; }
        public DateTime DateModifiedUtc { get; set; }
    }

    // the next lines are hardcoded data generation so you can explore the FileManager freely

    async Task<List<FlatFileEntry>> GetFlatFileEntries()
    {

        var workFiles = new FlatFileEntry()
            {
                MyModelId = "1",
                ParentId = null,
                Name = "Work Files",
                IsDirectory = true,
                HasDirectories = true,
                DateCreated = new DateTime(2022, 1, 2),
                DateCreatedUtc = new DateTime(2022, 1, 2),
                DateModified = new DateTime(2022, 2, 3),
                DateModifiedUtc = new DateTime(2022, 2, 3),
                Path = Path.Combine("files"),
                Size = 3 * 1024 * 1024
            };

        var Documents = new FlatFileEntry()
            {
                MyModelId = "2",
                ParentId = workFiles.MyModelId,
                Name = "Documents",
                IsDirectory = true,
                HasDirectories = false,
                DateCreated = new DateTime(2022, 1, 2),
                DateCreatedUtc = new DateTime(2022, 1, 2),
                DateModified = new DateTime(2022, 2, 3),
                DateModifiedUtc = new DateTime(2022, 2, 3),
                Path = Path.Combine(workFiles.Path, "documents"),
                Size = 1024 * 1024
            };

        var Images = new FlatFileEntry()
            {
                MyModelId = "3",
                ParentId = workFiles.MyModelId,
                Name = "Images",
                IsDirectory = true,
                HasDirectories = false,
                DateCreated = new DateTime(2022, 1, 2),
                DateCreatedUtc = new DateTime(2022, 1, 2),
                DateModified = new DateTime(2022, 2, 3),
                DateModifiedUtc = new DateTime(2022, 2, 3),
                Path = Path.Combine(workFiles.Path, "images"),
                Size = 2 * 1024 * 1024
            };

        var specification = new FlatFileEntry()
            {
                MyModelId = "4",
                ParentId = Documents.MyModelId,
                Name = "Specification",
                IsDirectory = false,
                HasDirectories = false,
                Extension = ".docx",
                DateCreated = new DateTime(2022, 1, 5),
                DateCreatedUtc = new DateTime(2022, 1, 5),
                DateModified = new DateTime(2022, 2, 3),
                DateModifiedUtc = new DateTime(2022, 2, 3),
                Path = Path.Combine(Documents.Path, "specification.docx"),
                Size = 462 * 1024
            };

        var report = new FlatFileEntry()
            {
                MyModelId = "5",
                ParentId = Documents.MyModelId,
                Name = "Monthly report",
                IsDirectory = false,
                HasDirectories = false,
                Extension = ".xlsx",
                DateCreated = new DateTime(2022, 1, 20),
                DateCreatedUtc = new DateTime(2022, 1, 20),
                DateModified = new DateTime(2022, 1, 25),
                DateModifiedUtc = new DateTime(2022, 1, 25),
                Path = Path.Combine(Documents.Path, "monthly-report.xlsx"),
                Size = 538 * 1024
            };

        var dashboardDesign = new FlatFileEntry()
            {
                MyModelId = "6",
                ParentId = Images.MyModelId,
                Name = "Dashboard Design",
                IsDirectory = false,
                HasDirectories = false,
                Extension = ".png",
                DateCreated = new DateTime(2022, 1, 10),
                DateCreatedUtc = new DateTime(2022, 1, 10),
                DateModified = new DateTime(2022, 2, 13),
                DateModifiedUtc = new DateTime(2022, 2, 13),
                Path = Path.Combine(Images.Path, "dashboard-design.png"),
                Size = 1024
            };

        var gridDesign = new FlatFileEntry()
            {
                MyModelId = "7",
                ParentId = Images.MyModelId,
                Name = "Grid Design",
                IsDirectory = false,
                HasDirectories = false,
                Extension = ".png",
                DateCreated = new DateTime(2022, 1, 12),
                DateCreatedUtc = new DateTime(2022, 1, 12),
                DateModified = new DateTime(2022, 2, 13),
                DateModifiedUtc = new DateTime(2022, 2, 13),
                Path = Path.Combine(Images.Path, "grid-design.jpg"),
                Size = 1024
            };

        var files = new List<FlatFileEntry>()
            {
                workFiles,

                Documents,
                specification,
                report,

                Images,
                dashboardDesign,
                gridDesign
            };

        return await Task.FromResult(files);

    }
}

See Also

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